ecard

I spent some time today reworking the ecard module, knowing I'm going to need something similar at work. The main changes are:

• A few more configurable language bits, like the thank you message.
• md5-based URLs of the form ecard/view/message_hash/pickup_hash.
• A tracker that records sends, recipients, and pickups so you can tell which ecards are most popular.
• Compliance with Drupal coding standards: I'm not getting any errors from coder now.
• Removed reliance on $_SESSION

I've attached my version of ecard for Drupal. I haven't updated the documentation files, created install commands for postgres, or looked at D6 yet.